$NetBSD: patch-doc_sl__SI_Makefile.in,v 1.1 2021/06/10 12:48:50 nia Exp $

Avoid a variable specific to GNU make.

--- doc/sl_SI/Makefile.in.orig	2019-09-06 09:55:04.000000000 +0000
+++ doc/sl_SI/Makefile.in
@@ -587,7 +587,7 @@ blackbox.1: blackbox.1.in
 	$(SED) -e "s,@defaultmenu@,$(DEFAULT_MENU)," \
 		-e "s,@pkgdatadir@,$(pkgdatadir)," \
 		-e "s,@version@,$(VERSION)," \
-		$< > $@
+		blackbox.1.in > $@
 
 # Tell versions [3.59,3.63) of GNU make to not export all variables.
 # Otherwise a system limit (for SysV at least) may be exceeded.